How did accelerometer evolve?
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Accelerometer technology has evolved significantly over the years. Initially developed in 1923 for industrial applications , accelerometers have progressed to tri-axial Force Balanced Accelerometers (FBA) designed for seismic, structural, aerospace, and commercial uses with improved sensitivity and reliability . The evolution continued with the fielding of accelerometer devices in national surveys and workshops between 2003 and 2010, enhancing their role in population surveillance and public health . Current accelerometer-based devices capture and store large volumes of raw acceleration data, prompting a shift towards activity characterization and energy expenditure estimation based on raw signals, necessitating collaborative analytic approaches . Accelerometers developed for gravitational wave interferometric detectors require strong directionality, vacuum compatibility, and high low-frequency sensitivity, influencing advancements in both the GW and geophysics fields .
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| Papers (5) | Insight |
|---|---|
15 Citations | The accelerometer evolved from bulky, low-frequency devices in 1923 to modern MEMS accelerometers used in engineering and medicine for measuring acceleration and vibrations with improved efficiency and size. |
7 Citations | Accelerometers for gravitational wave detectors evolved with strong directionality, vacuum compatibility, and low-frequency sensitivity, inspired by geophysics instruments, now influencing geophysics field. |
Open access•Journal Article | The accelerometer evolved through indigenous design and development, utilizing variable capacitance transduction and electromagnetic feedback for seismic, structural, aerospace, and commercial applications with characteristics like natural frequency and noise level evolution. |
| Accelerometers evolved from small-capacity devices to capturing raw acceleration signals for improved physical activity characterization, shifting from count-based to feature-based approaches, and emphasizing collaborative analytic methods. | |
| Accelerometer technology evolved rapidly over the past two decades, with advancements in device deployment, workshop recommendations, and increased collaboration for population surveillance and public health applications. |
Related Questions
Who invented accelerometer?4 answersThe accelerometer was invented by the British Thomson-Houston Co., Ltd. in 1953, as described in Context_3. This accelerometer design included a movable armature centrally mounted between two pairs of salient poles, utilizing A.C. energized coils and induced currents to measure acceleration along specific axes. Additionally, the English Electric Co. Ltd. introduced an accelerometer in 1957, featuring piezoelectric crystals arranged to cancel out thermal effects, as detailed in Context_4. Over time, accelerometers evolved from bulky devices with limited applications to more compact and versatile sensors. The early versions, like the one from 1923 described in Context_2, were primarily used for industrial purposes to measure acceleration and vibrations. These advancements paved the way for modern accelerometers widely used in navigation systems, electronic devices, and various other applications.
How does an accelerometer work?5 answersAn accelerometer is a device used to measure acceleration forces. It can measure both static forces, such as gravity, and dynamic forces caused by movement or vibration. There are different types of accelerometers with various working principles. One type uses a piezo unit connected to a charge amplifier to convert linear acceleration into an electrical signal. Another type uses a cantilever and a tunneling gap to maintain a constant tunneling current, which is proportional to the acceleration, by controlling the gate voltage. Another approach involves designing and simulating a microelectromechanical system (MEMS) accelerometer using software, which can measure displacements and capacitance to determine acceleration. Additionally, accelerometers can be manufactured by placing a magnet on a substrate and forming a conductive layer with a movable mass, allowing the mass to move in response to acceleration. Another design uses variations in capacitance between a moving mass and a fixed part to detect and measure movement.
What algorithm is used by actigraph accelerometer?5 answersThe actigraph accelerometer uses different algorithms for various purposes. One study proposed an approach called SedUp to differentiate between sedentary and standing postures using logistic regression classifier based on wrist elevation and motion variability. Another study used actigraphic algorithm to improve the accuracy of sleep detection by comparing two modes of input: acceleration on the x-axis and vector magnitude of acceleration in 3 dimensions. A different study evaluated the criterion validity of an automated sleep detection algorithm applied to data from three research-grade accelerometers worn on each wrist. Another paper introduced a pipeline called DPSleep for inferring sleep onset, duration, and quality from raw accelerometer data. Lastly, a study assessed the test-retest reliability of adult accelerometer-measured physical activity using different algorithms for data processing.
How earthquake accelerometer work?5 answersAn earthquake accelerometer is a device used to detect and measure earthquake vibrations. It works by sensing the inertial forces applied to the accelerometer and generating an output signal in response to these forces. Different types of earthquake accelerometers have been developed. One type uses a vibration sensor system with an accelerometer that outputs acceleration data. Another type is a seismic accelerometer that uses directional piezoelectric sensing elements and an integrated circuit to measure and record low frequencies and large dynamic measurement ranges. There are also earthquake rotation accelerometers that measure rotational acceleration. These accelerometers use pendulum differential capacitance energy transducers, moving-coil dampers, and a circuit board to accurately monitor earthquake rotation. Another variation is the varying apparent mass accelerometer, which detects earthquake vibrations by measuring changes in capacitance between electrodes when an acceleration exceeds a threshold.
What is accelerometer?4 answersAn accelerometer is a device that measures force due to gravity or a change in speed or direction of travel. It is a flexible tool for researchers in various disciplines, including group processes and social sciences. Accelerometers can be used to measure linear acceleration in orientation and navigation systems, as well as in seismic measurements. They are also promising for characterizing physical activity patterns in free living. In addition, accelerometers in mobile devices can detect motion, orientation, tilt, and gestures, and are commonly used for screen rotation and controlling games and applications. The performance of accelerometers depends on the dimensions of the central mass and flexible arms, with sensitivity and operating frequency range being important parameters.
What is a Triaxial Accelerometer?5 answersA triaxial accelerometer is a device used for measuring acceleration in three directions simultaneously. It consists of a mass and multiple groups of capacitance that detect movement in different axes. The device can be designed using various structures, such as a bonding substrate, support frame, sensitive mass block, detection beam, and cantilever beam. Another design includes a base plate, suspension, and elastic connection roof beams. Additionally, a triaxial piezoelectric accelerometer may have a housing, pedestal, connector, and sensor assemblies. Triaxial accelerometers can be used for various applications, including tunnel magnetoresistance detection, low-frequency vibration detection, and calibration of the device under test. These devices are compact, stable, and capable of detecting acceleration in three directions simultaneously.